Journal
BIORESOURCE TECHNOLOGY
Volume 118, Issue -, Pages 204-209Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2012.03.028
Keywords
Superabsorbent; Wheat straw; Cellulose; Swelling; Deswelling
Funding
- National Natural Science Foundation of China [21007034, 50878121]
- Natural Science Foundation of Shandong Province [ZR2010EQ031]
- Foundation for Young Excellent Scientists of Shandong Province [BS2009NY005]
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Swelling behavior is an important characteristic for superabsorbents. A wheat straw-based superabsorbent (WS-SAB) was prepared by graft copolymerization of acrylic acid, acrylic amide and dimethyl diallyl ammonium chloride onto the cellulose of wheat straw, and its swelling and deswelling behavior was investigated. The product had a water absorbency of 133.76 g/g in distilled water and 33.83 g/g in 0.9 wt.% NaCl solution. Fourier transform infrared spectroscopy and scanning electron microscopy indicated that the monomers were successfully grafted onto the wheat straw. The largest swelling capacity was at pH 6. The effect of ions on the swelling was in the order: Na+ > K+ > Mg2+ > Ca2+ and Cl- > SO42-. The swelling capacity did not change after several times of water absorption and release. (C) 2012 Elsevier Ltd. All rights reserved.
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